Improvement in taper-boring attachments to engine-lathes



ZSheets-Sheetl. P. L. ROGERS;

TAPER BORING ATTACHMENT TO ENGINE LATHES. I 1' 185,136; Patented Dec. 5,1876.

THE GRAPHIC CU-PLY PETER L. ROGERS, OF BAY CITY, MICHIGAN.

IMPROVEMENT IN TAPER-BORING ATTACHMENTS TO ENGlNE-LATHES.

Specification forming part of Letters Patent No. 185,136, dated December5, 1876; application filed June 6, 1876.

To all whom it may concern:

Be it known that 1, PETER L. ROGERS, of Bay City, in the county of Bayand State of- Michigan, have invented a new and useful Attachment toEngine-Lathes for Boring Tapers, of which the following is aspecification;

The object I have in view is to provide a simple, but efiective and verycheap, attachment to an engine-lathe, for turning or boring holes inmetal to any desired taper, consisting, merely, of a swingingtool-carrier pivoted to the traverse-stand of the carriage, with aguide-yoke pivoted to its tail end, and an adjustable guide secured tothe tail-stock and tail-mandrel of the lathe, as more fully hereinafterset forth. 4

Figure 1 is a perspective view of an enginelathe (omitting thehead-stock) fitted with my attachment. Fig. 2 is a plan ofthe-attachment, showing also, in outline, the positions of the parts attwo points in the work. Fig.

-3 is a longitudinal vertical section.

the plate in position, but are not screwed tight enough to bind it,leaving it free to swing on the axis. d is an inside tool, clamped ontothe swing-plate, as shown. The pivot to is un der one end of the plate,the other extending toward the tail-stock, where it has pivoted to it,at e, an upright yoke, 1, on each of whose side pillars is afriction-sleeve, f. J is a guideplate, fastened at one end by aset-screw, g, to the tail-stock, in the longitudinal axis thereof. Thetail-center is removed from the tail-mandrel, and in its place isinserted a conical steady-pin at the back of a block, K, on whose headthe guide-plate J rests, and to which it is adjust-ably secured by aset-screw, h, passing through a segment-slot in said plate, and tappedinto said block. The sides of the guide-plate are parallel, and itswidth is such that it will enter between the rollers of the side pillarsof the yoke, or rather that they will embrace it when moved with thecarriage.

To bore a taper ot' a given angle, all that is required is to adjust theguide-plate to the same angle with relation to the axis and We of thelathe; then, as the yoke moves along the guide-plate, it will swing theplate in one direction and the tool in the opposite direction, causingit to bore the hole out to the angle or taper given by the guide.

The hole may be bored from either end clear through, or partly through,and finished straight, by clamping the tool-plate and running back thetail-mandrel, so as to detach the guideplate, and, it necessary, thework can then be faced up. The cut of the tool can be adjusted by thetraverse-screw in the usual way.

What I claim as my invention is- In a taper-boring attachment toan-enginelathe, the combination of the tool-p1ate,adapted to swing onthe traverse-standard, the yoke, pivoted to the tail end thereof, andthe guide-plate, adapted to be adjustably secured to the tail-stock,substantially as described.

PETER L. ROGERS. Witnesses:

H. S. SPRAGUE, EDWARD BARTHEL.

